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Jonathan Clark

Jonathan Clark

Jonathan is a Partner in our Dispute Resolution group and also a member of our Global Investigations Group. His practice spans a broad range of commercial litigation, investigations and contentious regulatory matters. Jonathan also has a strong contentious insolvency and competition litigation practice.

Jonathan’s clients include leading financial institutions, and major corporates.

Highlights include advising:

Banco Santander Totta in successful litigation in the High Court and Court of Appeal relating to the validity of interest rate swaps entered into on ISDA terms between the bank and Portuguese public sector companies. This case was the first case to be heard in the new Financial List in the High Court and the Court of Appeal decision is the leading judgement on the extent to which “mandatory” provisions of foreign law can be applied to English law governed contracts

Rolls-Royce on investigations into allegations of bribery and corruption conducted by the UK SFO, the US DoJ and the Brazilian MPF and the resolution of those investigations by way of deferred prosecution agreements in the UK and US and a leniency agreement in Brazil. UK deferred prosecution agreement was just the third (and by far the largest) such agreement and the first to be concluded concurrently with the resolution of non-UK investigations

Deutsche Bank in relation to the LIBOR investigation, which culminated in a high profile settlement with a number of US authorities and the UK Financial Conduct Authority in April 2015

British Airways in its defence of multiple claims for damages in excess of £1 billion in relation to the alleged air cargo cartel, including the decision of the Court of Appeal in October 2015 to strike out significant parts of the claimants' case

a major international financial institution in relation to regulatory investigations in multiple jurisdictions and cross-border litigation arising out of the same credit derivative transactions

Japan Tobacco (Gallaher) on its judicial review of the Competition Markets Authority in relation to the tobacco investigation undertaken by the CMA's predecessor, the Office of Fair Trading

Clients in a number of different industries on appeals to the Competition Appeals Tribunal from decisions of the Office of Fair Trading and the Competition Commission

Glitnir in successfully defeating an attempt by Jon Asgeir Johannesson, Glitnir's former principal shareholder, to lift the worldwide freezing order and in relation to resolving disputes with a number of its counterparties in derivative transactions entered into under ISDA Master Agreements

Jonathan joined Slaughter and May from Bell Gully in 2007, having qualified in New Zealand. He is recommended for Financial Services (contentious) and Banking Litigation in the Legal 500, 2016.